package org.bigjava.web;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;

/**
 * @ProjectName: JavaWeb
 * @ClassName: BaseServlet
 * @Description: TODO
 * @Author: 洛笙
 * @Date: 2020-06-04 23:25
 * @Version v1.0
 */
public abstract class BaseServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.解决post请求中文乱码问题，一定要在获取参数之前调用才有效
        req.setCharacterEncoding("UTF-8");
        //解决响应的中文乱码
        resp.setContentType("text/html;charset=UTF-8");
        String action = req.getParameter("action");
        try {
            //获取action业务鉴别字符串，获取相应的业务方法反射对象
            Method method = this.getClass().getDeclaredMethod(action, HttpServletRequest.class, HttpServletResponse.class);
            //调用目标业务方法
            method.invoke(this,req,resp);

        } catch (Exception e) {
            e.printStackTrace();
            //把异常抛给Filter过滤器
            throw new RuntimeException(e);
        }

    }
}
